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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ddfcb06c7a18e32655e29078857b601c4225d7e81771554fe3826fc97d10ef' 
  AND token = '1ns+aEqClPiDfOqum3EnxKr5FIKUXukvE5W7hlwVbAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}